From 0a29a03060f8efc718b2f92d72f2f26161baf28f Mon Sep 17 00:00:00 2001
From: Zoltan HERPAI <wigyori@uid0.hu>
Date: Thu, 16 Jul 2020 17:47:11 +0200
Subject: [PATCH] kirkwood: add fan_ctrl script for PWM fan management

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
---
 .../base-files/etc/uci-defaults/04_storafan   | 22 ++++++++++++++++++
 .../kirkwood/base-files/sbin/fan_ctrl.sh      | 23 +++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 target/linux/kirkwood/base-files/etc/uci-defaults/04_storafan
 create mode 100755 target/linux/kirkwood/base-files/sbin/fan_ctrl.sh

diff --git a/target/linux/kirkwood/base-files/etc/uci-defaults/04_storafan b/target/linux/kirkwood/base-files/etc/uci-defaults/04_storafan
new file mode 100644
index 0000000000..474d42d54e
--- /dev/null
+++ b/target/linux/kirkwood/base-files/etc/uci-defaults/04_storafan
@@ -0,0 +1,22 @@
+#
+# Copyright (C) 2020 OpenWrt
+#
+
+. /lib/functions.sh
+
+board=$(board_name)
+
+case "$board" in
+netgear,stora)
+	# Set fan script execution in crontab
+	grep -s -q fan_ctrl.sh /etc/crontabs/root && exit 0
+
+	echo "# stora fan script runs every 5 minutes" >> /etc/crontabs/root
+	echo "*/5 * * * * /sbin/fan_ctrl.sh" >> /etc/crontabs/root
+
+	# Execute one time after initial flash (instead of waiting 5 min for cron)
+	/sbin/fan_ctrl.sh
+	;;
+esac
+
+exit 0
diff --git a/target/linux/kirkwood/base-files/sbin/fan_ctrl.sh b/target/linux/kirkwood/base-files/sbin/fan_ctrl.sh
new file mode 100755
index 0000000000..bce8700736
--- /dev/null
+++ b/target/linux/kirkwood/base-files/sbin/fan_ctrl.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+CPU_TEMP=$(cut -c1-2 /sys/devices/platform/ocp@f1000000/f1011000.i2c/i2c-0/0-0048/hwmon/hwmon?/temp1_input)
+
+CPU_LOW=45
+CPU_MID=50
+CPU_HIGH=55
+
+if [ ! -e /sys/devices/platform/ocp@f1000000/f1011000.i2c/i2c-0/0-001b/hwmon/hwmon?/pwm1 ]; then
+	exit 0
+else
+	FAN_CTRL=$(ls /sys/devices/platform/ocp@f1000000/f1011000.i2c/i2c-0/0-001b/hwmon/hwmon?/pwm1)
+fi
+
+if [ "$CPU_TEMP" -ge "$CPU_HIGH" ]; then
+	echo "255" > $FAN_CTRL
+elif [ "$CPU_TEMP" -ge "$CPU_MID" ]; then
+	echo "100" > $FAN_CTRL
+elif [ "$CPU_TEMP" -ge "$CPU_LOW" ]; then
+	echo "50" > $FAN_CTRL
+else
+	echo "0" > $FAN_CTRL
+fi
-- 
2.30.2